JP2008100504A - Mold clamping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold clamping device which prevents generation of gap of the molds by reducing the influence of deflection of a mold platen in mold clamping by being assembled to a conventional mold clamping device, and can easily modify the conventional standard specification machine to be already delivered to a mold clamping device having a deformation preventive specification by applying to the conventional one, and furthermore highly accurately prevent the deflection of each force receiving plate of the mold platen in the mold clamping device having a transmission mechanism of the force through a narrow area near the center. <P>SOLUTION: In the mold clamping device, the mold platen is composed of the force receiving plates 21, 31, and mold attaching plates 22, 32 detachable to one surface of the force receiving plates and having a movable mold 11 and/or a fixed mold 10. Tapered truncated cone-shape or columnar connecting parts 22a, 32a are formed toward the force receiving plate at the side opposite to the mold of the mold attaching plates, and the mold attaching surface is formed at the mold side respectively, and bending deformation generated in the force receiving plate is prevented from being transmitted to the mold attaching plate by abutting the side surface opposite to the mold of the connecting part to the side surface of the mold of the force receiving plate and integrally fixing them. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement of a mold clamping device used in an injection molding machine or the like.

A configuration of a mold clamping device 100 of an injection molding machine that has been generally used in the past will be described with reference to FIG. In FIG. 4, 101 is a base frame (base), 102 is a stationary platen fixed to the base frame 101, and 103 is slidably mounted on a rail 104 fixed to the base frame 101 via a linear guide 105. The movable platen moves toward or away from the fixed platen 102, four tie bars connecting the four corners of the fixed platen 102 and the movable platen 103, and 106a at one end of the tie bar 106. The provided male screw portion 107, half nuts provided at the four corners of the movable mold plate 103, 108, a mold clamping cylinder which is a hydraulic cylinder for mold clamping provided at the four corners of the fixed mold plate 102, and 108a, the mold. The ram (piston) of the clamping cylinder 108, 109 is a moving cylinder that moves the movable mold platen 103, and 110 and 111 are the fixed mold platen 102 and possible, respectively. A fixed mold and a movable mold attached to the mold platen 103.
One end of the tie bar 106 is connected to the ram 108a of the mold clamping cylinder 108, and the male screw portion 106a at the other end can freely pass through the hole provided in the movable mold plate 103 and the opened half nut 107. When the half nut 107 is closed, the male thread portion 106a of the tie bar 106 and the female thread portion of the half nut 107 are screwed together so that the tie bar 106 and the movable mold plate 103 are connected.

  FIG. 4 shows a state when the mold clamping device 100 is performing a mold clamping operation. When the mold clamping device 100 is in a standby state, the half nut 107 is opened to the left and right (in a direction perpendicular to the drawing) and is connected to the tie bar 106. The engagement is released and the movable mold plate 103 is moved to the left side together with the movable mold 111 by the moving cylinder 109, and the right side surface of the movable mold 111 and the left side surface of the fixed mold 110 are opposed to each other. When performing injection molding, first, the movable mold plate 103 is moved to the right side of the figure by the moving cylinder 109, and the movable mold 111 and the fixed mold 110 are brought into contact with each other (mold closing). Next, the half nut 107 is closed to engage the movable mold plate 103 and the tie bar 106, pressure oil is supplied to the mold clamping cylinder 108 to generate tension on the tie bar 106, and the fixed mold 110 and the movable mold 111 are strongly clamped. (Clamping). A cavity (not shown) corresponding to a molded product is formed between the fixed mold 110 and the movable mold 111, and a product (molded product) is formed by injecting molten resin from an injection unit (not shown) into the cavity. . Next, the resin is cooled in the mold, the mold clamping cylinder 108 is loosened, and the movable mold plate 103 is moved to the left side of the figure by the moving cylinder 109 to open the space between the fixed mold 110 and the moving mold 111 (die opening). ) Take out the molded product.

  FIG. 4 shows a state in which the mold is clamped and the resin is injected. However, the fixed mold plate 102 and the movable mold plate 103 receive forces from the four corners toward each other by the tie bars 106, Are subjected to reaction forces by the fixed mold 110 and the movable mold 111, respectively. Both of these forces generate a three-dimensional bending deflection on both the stationary mold plate 102 and the movable mold plate 103 as shown by exaggerated lines in the drawing. At this time, when attention is paid to the fixed mold 110 and the movable mold 111, the fixed mold 110 and the movable mold 111 also bend on the contact surfaces of the fixed mold 110 and the movable mold 111 in the same manner as indicated by broken lines, and enter the cavity from the gap during injection. The molten resin to be filled flows out to form a so-called burr, which causes a problem that the accuracy of the product is lowered and the operation of removing the burr is required.

  Such a problem is that a movable mold plate is slidably guided between two fixed mold plates connected by tie bars at four corners, and between the movable mold plate and one fixed mold plate. In a toggle mold clamping device with a configuration in which a toggle mold and a fixed mold and a movable mold are respectively disposed between the movable mold plate and the other fixed mold plate, it is generated on the fixed mold plate to which the fixed mold is attached. In addition, when the tip of the link on the output side of the toggle device is mounted in the vicinity of the tie bar so as to be far away from the central portion of the movable platen, this also occurs in the movable platen.

  Various proposals have been made to improve the above-mentioned problems. For example, in Patent Document 1, in a mold clamping device having a configuration similar to that shown in FIG. 4, each of a stationary mold plate and a movable mold plate is a force receiving plate that receives a fastening force (clamping force) from a tie bar. It is composed of a mold mounting member (hereinafter referred to as a mold mounting board) that is detachably attached to one surface of the force receiving board, and the fixed mold and the movable mold are attached to this mold mounting board. The mold mounting board is connected by a bolt via a fastening force transmitting part (hereinafter referred to as a connecting part) whose outer periphery is smaller than the outer periphery of the mold mounting board, with a ring shape protruding from the center of one surface of the power receiving board. is there.

  When mold clamping is performed with this mold clamping device, the fixed side and movable side force receiving panels are subjected to large tensions at the four corners from the tie bars, and as described above (see broken lines in FIG. 4), bending bending occurs. Since the fastening force that presses the mounting plate is transmitted through the small top surface of the connecting portion that is in contact with the central portion, that is, the surface that contacts the force receiving plate, the influence of bending deflection transmitted to the mold mounting plate is reduced, Furthermore, since it is transmitted to the mold through a separate mold mounting board, the amount of bending deformation transmitted to the mold is sufficiently removed, and the generation of a gap between the fixed mold and the movable mold can be prevented.

  Also, for example, in Patent Document 2, the four corners are guided by the same tie bar between two fixed mold plates (stationary platen and rear platen) which are opposed to each other and are fixed at four corners by four tie bars. A movable platen (moving platen) that slides is disposed, a double toggle device is provided between one fixed platen (rear platen) and the movable platen (moving platen), and a movable platen (moving platen) Occurs on the stationary platen (stationary platen) and the movable platen (moving platen) during mold clamping, in contrast to the mold clamping device in which the movable die and stationary die are arranged between other fixed platens (stationary platen). A mechanism that eliminates deflection is open. In this mold clamping device, the fastening force (clamping force) received from the tie bars at the four corners is transmitted to a narrow area near the center of the outside of the stationary mold platen (stationary platen) (on the opposite side of the mold), and the four corners. In order to transmit the force received from the receiving end (staple) at the tip of the link of the toggle device to a narrow range near the center of the movable platen (moving platen), each support mechanism (force transmission) Member), receiving the mold clamping force at the four corners of the bottom, and narrowing the top surface, that is, from the surface to which the movable platen (moving platen) is attached, the fixed platen (stationary platen) and the movable platen (moving platen) It is intended to tell.

Japanese Patent Laying-Open No. 2001-1381 (FIG. 1) Japanese Patent No. 3591908 (FIG. 2)

Recently, in order to improve the accuracy of molded products and prevent the occurrence of burrs, as shown in Fig. 4, the fixed mold and the movable mold are directly attached to the fixed mold plate and the movable mold plate. There is a growing need for implementing countermeasures for preventing the deformation of the mold with respect to the conventional mold clamping apparatus 100 of the type in which the tie bar is clamped.
However, as described in Patent Document 1 (FIG. 1) and Patent Document 2 (FIG. 2), a mold clamping device having a deformation prevention specification that prevents deformation of a mold includes a fixed mold plate and a movable mold plate, a tie bar, or A force receiving panel that receives the clamping force from the link of the toggle device, a mold mounting plate that mounts the fixed mold and the movable mold, and a fastening force transmission part (hereinafter referred to as a small cross-sectional area) that connects the two formed on the force receiving panel. Therefore, when remodeling to a deformation-prevention type clamping device by applying it to a conventional standard-type mold clamping device that is not manufactured and preventing deformation, such as a delivery machine, Since it is difficult to modify the conventional pattern board to a power receiving panel having a connecting portion, the conventional pattern board cannot be used. In order to remodel the mold-clamping device with deformation prevention specifications, the fixed mold platen and the movable mold platen respectively have a fixed mold platen and a movable mold platen having a connecting portion, and a dedicated fixed mold platen unit comprising a mold mounting plate and There is a problem in that the range of members that need to be changed is increased because the dedicated movable platen unit must be replaced, and thus the cost and time required for modification are increased.

In Patent Document 2, since a clamping force is applied to the central part of the movable mold platen or the fixed mold platen, a direct bending moment due to the mold clamping force does not act. Since a bending moment due to the reaction force of the mold clamping force is generated in the rear platen that is not formed, a concave deflection is generated on the mold side. Further, since the four tie bars are fixed to the four corners of the fixed platen support portion and the rear platen, the bending of the fixed platen support portion and the bending of the rear platen are transmitted to the tie bar, and the mold is attached to the tie bar. A convex bending deformation (inward warping) occurs on the side. Since the tie bar is deformed inward, the movable mold platen and the fixed mold plate in which the tie bars are loosely inserted in the four corners are forced to bend and deform in the four corners of the mold plate so as to follow the inner warp deformation of the tie bar. There is a problem that bending occurs. This is particularly likely to occur in a stationary mold plate, a movable mold plate, and a low-rigid plate plate in which the clearance between the tie bar and the tie bar loose insertion hole is made small in order to improve accuracy.
The present invention reduces the influence of bending of the fixed mold plate and the movable mold plate at the time of mold clamping by assembling the conventional mold clamping device, prevents the occurrence of a gap in the mold, To provide a mold clamping device that can be easily modified to a deformation-proof specification mold clamping device by applying to a standard specification machine, and fixing in a mold clamping device having a force transmission mechanism through a narrow area from the center The purpose is to prevent the bending of each force receiving plate of the platen and the movable platen with higher accuracy.

The present invention solves the above problems by the following means.
(1) The mold clamping apparatus of the first means includes a fixed mold plate to which a fixed mold is attached, and a movable mold plate to which the fixed mold plate can be moved close to and away from the fixed mold plate. And a clamping device that clamps the movable mold plate and the fixed mold plate by applying a fastening force so as to bring the movable mold plate close to the fixed mold plate, the movable mold plate and / or the fixed platen. The mold platen includes a force receiving plate that receives the fastening force, and a mold mounting plate that is detachable from one surface of the force receiving plate and to which the movable mold and / or the fixed mold is attached. In the mold clamping device, the anti-mold side of the mold mounting plate forms a tapered frustum-like or columnar connecting portion toward the force receiving plate, and the mold side forms a mold mounting surface, respectively. The anti-mold side surface of the connecting portion and the mold side surface of the force receiving plate abut and are fixed together. More, characterized in that the deformation bending occurs in the force-receiving plate was prevented transmitted to the mold mounting platens.

  (2) The mold clamping device of the second means is a plurality of mold clamping devices according to the first means, wherein the force receiving plate of the fixed mold plate and the force receiving plate of the movable mold plate can be connected. A tie bar is provided, and the force receiving plate of the fixed platen has a hydraulic cylinder that moves the tie bars in the axial direction.

  (3) The mold clamping device of the third means is a toggle which is fixed to the gantry and has four corners each connected to the fixed mold plate by tie bars in the mold clamping device of the first means or the second means. A movable platen that is guided and slid by the tie bar disposed between the support plate, the toggle support plate and the fixed mold plate; and disposed between the movable platen and the toggle support plate. It is characterized by comprising a toggle device, and a movable mold and a fixed mold are respectively attached to opposing surfaces of the movable mold plate and the fixed mold plate.

(4) The mold clamping device of the fourth means is a modification of the mold clamping device of the deformation prevention specification by additionally fixing only the mold mounting plate in the mold clamping devices of the first to third means. It is characterized by doing.
(5) The mold clamping device of the fifth means is the above-mentioned mold clamping device of the first to fourth means, wherein notches are provided at the four corners of the mold mounting plate so as not to interfere with the tie bar. It is characterized by that.
(6) The mold clamping device of the sixth means includes a fixed mold plate to which a fixed mold is attached, and a movable mold plate to which a movable mold is attached that can move close to and away from the fixed mold plate. A toggle support plate fixed to the frame and connected to the fixed platen at each of the four corners by a tie bar, and guided and slid by the tie bar disposed between the toggle support plate and the fixed platen. A movable movable platen, and a toggle device disposed between the movable platen and the toggle support plate, and applying a fastening force to bring the movable platen close to the fixed platen, A double toggle type clamping device for clamping a movable mold plate and the fixed mold plate, wherein the movable mold plate and / or the fixed mold plate includes a force receiving plate that receives the fastening force, and a force receiving plate of the force receiving plate. The movable mold and / or the detachable mold with respect to one surface. A mold mounting plate to which a fixed mold is mounted, the anti-mold side of the mold mounting plate being tapered toward the force receiving plate, and a connecting portion having a tapered frustum or column shape, and the mold side being a mold Each has a mold attachment surface, and the anti-mold side surface of the connecting portion and the mold side surface of the force receiving plate are abutted and fixed integrally.

  According to the first to third aspects of the present invention, the clamping force from the tie bars applied to the four corners of the force receiving plate is away from the contact surface of the connecting portion of the central die mounting plate. A bending moment is generated, and the force receiving plate deforms concavely on the mold side, but the area of the connecting part of the mold mounting plate is narrow, and the bending moment transmitted through this area is reduced, so that the mold mounting The bending deformation of the board is alleviated, the bending deformation of the mold attached to the mold mounting board is prevented, and the problems associated with the deformation can be solved.

  In the invention according to claim 4, since the connecting portion that connects the force receiving plate and the mold mounting plate is formed in the mold mounting plate, the mold clamping device without the deformation preventing function is used as the mold clamping device of the deformation preventing specification. When remodeling, it is not necessary to replace the movable platen or fixed platen already assembled with the dedicated movable platen unit or dedicated fixed platen unit. Since it can be remodeled into a deformation-prevented mold by additionally fastening and fixing to the mold mounting surface, the cost and time required for remodeling can be greatly reduced.

  Since the invention according to claim 5 is formed so as not to interfere with the tie bar by providing notches at the four corners of the mold mounting plate, the inner warp deformation of the tie bar accompanying the bending of the force receiving plate during mold clamping Can be transmitted to the mold mounting plate, and the mold mounting plate can be prevented from being bent along the inward deformation of the tie bar.

(First embodiment)
As a first embodiment of the present invention, a case where the present invention is applied to both a fixed platen and a movable platen will be described with reference to FIGS.
1 is a front view of a mold-clamping apparatus 200 having a deformation-prevention specification according to the present invention corresponding to the conventional mold-clamping apparatus 100 not having the deformation-prevention specification shown in FIG. 4, and FIG. In both figures, 1 is a base frame (base), 2 is a fixed mold plate fixed to the base frame 1, and 3 is slidably mounted on a rail 4 fixed to the base frame 1 via a linear guide 5. The movable platen moves toward or away from the fixed platen 2, 6 is a tie bar connecting the four corners of the fixed platen 2 and the movable platen 3, and 6 a is provided at one end of the tie bar 6. 7 is a half nut provided at the four corners of the movable mold platen 8, 8 is a mold clamping cylinder provided at the fixed mold platen 2, and 8a is a mold clamping cylinder 8 provided at the other end of the tie bar 6. The ram 9 is a moving cylinder for moving the movable platen 3.
Reference numerals 10 and 11 denote a fixed mold and a movable mold attached to the fixed mold mounting board 22 and the movable mold mounting board 32, respectively.

The fixed mold platen 2 includes a fixed force receiving plate 21 coupled to the tie bar 6 and a fixed mold mounting plate 22 coupled to the fixed force receiving plate 21 and a sinking bolt (hexagon socket head bolt) 35. Similarly, the movable mold platen 3 includes a movable force receiving plate 31 and a movable mold mounting plate 32 coupled to the movable force receiving plate 31 with a sinking bolt (not shown).
Each of the fixed force receiving plate 21 and the movable force receiving plate 31 has the same degree of rigidity as a conventional mold platen. The fixed force receiving plate 21 has a hole 36 into which a nozzle portion of an injection unit (not shown) is inserted, and a fixed force receiving plate 21. A female screw for connection to the mold mounting plate 22 is provided, and a hole for an ejector pin device (not shown) and a female screw for connection to the movable die mounting plate 32 are provided in the movable force receiving plate 31. Yes.
The fixed mold mounting board 22 and the movable mold mounting board 32 are panels having an appropriate rigidity with a rectangular planar shape, and the surfaces facing each other are mold mounting surfaces, which are necessary for mounting the mold. A T-groove 37, a female screw hole (not shown), a means for attaching a die such as a magnet device for attracting the die, and a deep seat of the coupling bolt 35 for connection to the fixed force receiving plate 21 or the movable force receiving plate 31. A countersunk bolt hole is provided, and a tapered truncated cone-shaped or polygonal frustum-shaped coupling portion 22a and a coupling portion 32a having an appropriate height are provided on the back surface of the mold mounting surface. The top surface of the smaller area is brought into contact with the fixed force receiving plate 21 and the movable force receiving plate 31, respectively, and is coupled by the sinking bolt 35 through the bolt hole with the counterbore. The area of the bottom surfaces of the connecting portions 22a and 32a is preferably slightly smaller than the mounting area of the largest mold to be used, and the area of the top surface is preferably slightly larger than the mounting area of the smallest mold to be used.
Further, when the front areas of the fixed mold mounting plate 22 and the movable mold mounting plate 32 are increased, notches 22b and 32b (see FIGS. 1 and 2) are provided at the four corners so as not to interfere with the tie bar 6. Keep it.
In addition, when the connection part 22a and the connection part 32a of a truncated cone shape or a polygon frustum shape are made into a polygonal column or a cylinder, the magnitude | size of a cross section is the magnitude | size of the intermediate | middle of the base of a frustum or a polygon frustum, and a top surface It is good to make it.

The operation at the time of mold clamping of the mold clamping apparatus 200 having the above configuration will be described. Although the case where the shape of the connection part 22a and the connection part 32a is frustum shape is demonstrated, the case where it is columnar shape is also the same.
First, the movable mold 3 is brought close to the fixed mold 2 by the moving cylinder 9, and the movable mold 11 is brought into contact with the fixed mold 10. Next, tension is generated in the tie bar 6 by the mold clamping cylinder 8, and the fixed mold 10 and the movable mold 11 are strongly clamped. Now, paying attention to the fixed force receiving plate 21, the fixed force receiving plate 21 receives a force (concentration force) directed inward (left side in FIG. 1) from the tie bar 6 at four corners, and a fixed mold mounting plate 22 at the center. A bending moment is generated by receiving a reaction force (distributed force) directed outward (right side in FIG. 1) from the connecting portion 22a, and the fixed force receiving plate 21 is deformed into a concave shape on the fixed mold 10 side. Next, paying attention to the fixed mold mounting plate 22, the outer side is sandwiched by the central portion of the fixed force receiving plate 21 and the inner side is sandwiched by the fixed mold 10 to receive the compressive force. Since the surface contacting the fixed force receiving plate 21 has a small area and is formed separately from the fixed force receiving plate 21, the influence of the bending deformation of the fixed force receiving plate 21 is reduced, and the fixed die mounting plate 22 can maintain a sufficiently flat surface, and similarly, the movable mold mounting plate 32 can also maintain a sufficiently flat surface. Therefore, the generation of a gap between the fixed mold 10 and the movable mold 11 is suppressed, and the variability is reduced. Can be prevented.
In particular, when the connecting portion 22a and the connecting portion 32a provided on the fixed mold mounting plate 22 and the movable mold mounting plate 32 are frustums, the mold generated when the mounting area of the mold is large is used. This has a great effect of resisting the moment of bending.

  Further, there is no problem even if the conventional standard specification molds 102 and 103 having the above-described mold attaching means are used as the fixed force receiving plate 21 and the movable force receiving plate 31. That is, since the connecting part that connects the force receiving plate and the mold mounting plate is formed in the mold mounting plate, when remodeling a mold clamping device without a deformation prevention function to a deformation clamping type, There is no need to replace the movable platen or fixed platen already assembled with the dedicated movable platen unit or dedicated fixed platen unit, and the mold mounting plate having the connecting portion can be directly replaced with the mold platen. Since it can be remodeled into a deformation-prevention type platen by additionally fastening and fixing to the mold mounting surface, the cost and time required for remodeling can be greatly reduced.

  Further, the notches 22b and 32b are provided at the four corners of the mold mounting boards 22 and 32 so as not to interfere with the tie bar 6, so that the force receiving boards 21 and 31 are bent at the time of mold clamping. The inward warpage deformation of the tie bar 6 is transmitted to the mold mounting plates 22 and 32, and the problem that the mold mounting plates 22 and 32 are bent along the inner warping deformation of the tie bar 6 can be prevented.

(Second Embodiment)
As a second embodiment of the present invention, as in the first embodiment, a case where the present invention is applied to both a stationary mold plate and a movable mold plate will be described with reference to FIG.
FIG. 3 is a front view showing a case where the mold platen of the present invention is applied to a double toggle type mold clamping device 300. In FIG. 3, 41 is a stationary platen (stationary platen), 42 is a toggle support plate (rear platen), 43 is a movable platen, 44 is a tie bar, 45 is a toggle device, and 46 and 47 are a fixed die and a movable die, respectively. It is.
The fixed platen 41 and the toggle support plate 42 are fixed by a base frame (frame) (not shown) and four tie bars 44, and the movable platen 43 is guided and slid by a tie bar 44 disposed therebetween. Move. The fixed mold 46 and the movable mold 47 are attached to opposing surfaces of the fixed mold plate 41 and the movable mold plate 43.
The toggle device 45 is driven by a drive motor 48, moves the tips of the four links 49 on the output side, and transmits the force via a metal receiving (staple) 53a provided on the movable mold plate 43 to close the mold and mold. Tighten. Between two adjacent ones of the four links 49, the distance between the receivers 53a is increased in order to accommodate members such as an ejector device, and the position of the receiver 53a can approach the position of the tie bar 44. Many. For this reason, in the movable mold plate 43 as well as the fixed mold plate 41, bending deformation occurs due to the tightening forces received from the four corners. Therefore, in order to prevent the influence of the bending deformation, the fixed mold plate 2 of the first embodiment. In addition, the movable platen 3 has the same structure. The fixed mold plate 41 corresponding to the fixed mold platen 2 is formed by a fixed force receiving plate 51 corresponding to the fixed force receiving plate 21 and a fixed mold attaching plate 52 corresponding to the fixed mold attaching plate 22. The top surface of the connecting portion 52a provided on the fixed mold mounting plate 52 is brought into contact with the fixed force receiving plate 51 and is connected by the sinking bolt 35. The action of the fixed mold plate 41 is the same as that of the fixed mold plate 2. The same.

The movable mold platen 43 is formed of a movable force receiving plate 53 and a movable mold mounting plate 54. The movable force receiving plate 53 slides with four corners guided by tie bars 44, and a toggle device 45 on one side. The mold 53 is provided with the receiving metal 53a for receiving the tip (pin) of the link 49 at a large distance from each other. The movable mold mounting board 54 has a connecting portion 54a on one surface and the movable mold on the opposite surface. 47 is provided so that the periphery does not come into contact with the tie bar 44. The operation of the movable platen 43 is the same as that of the fixed platen 2.
When the position of the metal receiving 53a of the link 49 provided on the toggle device side of the movable platen 43 is away from the four corners of the movable force receiving plate 53 and approaches the center, the movable force receiving plate 53 has a large size. Since no bending moment is generated, no special measures need to be taken.

  Further, as in the first embodiment, there is no problem even if a conventional standard specification pattern board having the above-mentioned mold mounting means is used as the force receiving boards 51 and 53. That is, since the connecting part that connects the force receiving plate and the mold mounting plate is formed in the mold mounting plate, when remodeling a mold clamping device without a deformation prevention function to a deformation clamping type, There is no need to replace the movable platen or fixed platen already assembled with the dedicated movable platen unit or dedicated fixed platen unit, and the mold mounting plate can be used directly on the mold mounting surface of the platen. Since it can be remodeled into a deformation-prevention type plate by additional fastening and fixing, the cost and time required for remodeling can be greatly reduced.

Further, the notches 52b and 54b are provided at the four corners of the mold mounting boards 52 and 54 so as not to interfere with the tie bar 44. Therefore, the force receiving boards 51 and 53 are bent when the molds are clamped. The inward warpage deformation of the tie bar 44 is transmitted to the mold mounting plates 52 and 54, and the mold mounting plates 52 and 54 can be prevented from being bent along the inner warping deformation of the tie bar 44.

  As described above, in the mold clamping device according to the present invention, bending deformation of the mold mounting plate is reduced, bending deformation of the mold attached to the mold mounting plate is prevented, and problems associated with the deformation are eliminated. It is suitable for use as a template.

It is a front view which shows the mold clamping apparatus which concerns on the 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is a front view which shows the mold clamping apparatus which concerns on the 2nd Embodiment of this invention. It is a front view which shows the outline of the conventional mold clamping apparatus.

Explanation of symbols

2, 41 Fixed mold board 3, 43 Movable mold board 6, 44 Tie bar 8 Clamping cylinder 10, 46 Fixed mold 11, 47 Movable mold 21, 51 Fixed force receiving board 22, 52 Fixed mold mounting board 22a, 32a , 52a, 54a Connecting portions 22b, 32b, 52b, 54b Notches 31, 53 Movable force receiving panels 32, 54 Movable mold mounting plate 42 Toggle support plate (rear platen)
45 Toggle device 200, 300 Clamping device

Claims (6)

  A fixed mold having a fixed mold; and a movable mold having a movable mold that can be moved to and away from the fixed mold, and the movable mold is close to the fixed mold A mold clamping device that tightens the movable mold plate and the fixed mold plate by applying a fastening force so that the movable mold plate and / or the fixed mold plate receive the fastening force; And a mold clamping device that is detachable from one surface of the force receiving plate and includes a mold mounting plate to which the movable mold and / or the fixed mold is mounted. The mold side forms a tapered frustum-shaped or columnar connecting portion toward the force receiving plate, and the mold side forms a mold mounting surface, respectively, and the anti-mold side surface of the connecting portion and the force receiving plate By bending the side of the mold and fixing it together, the bending that occurs in the force receiving plate Mold clamping device, characterized in that the deformation was prevented transmitted to the mold mounting platens.   2. The mold clamping apparatus according to claim 1, further comprising a plurality of tie bars capable of connecting the force receiving plate of the fixed mold plate and the force receiving plate of the movable mold plate, and the force receiving plate of the fixed mold plate. Has a hydraulic cylinder for moving the tie bars in the axial direction.   3. The mold clamping device according to claim 1, wherein a toggle support plate fixed to the gantry and connected to the fixed mold plate at each of the four corners by tie bars, and the toggle support plate and the fixed mold plate. A movable mold plate guided and slid by the tie bar disposed therebetween, and a toggle device disposed between the movable mold plate and the toggle support plate, the movable mold plate and the fixed mold plate. A mold clamping device characterized in that a movable mold and a fixed mold are respectively attached to opposite surfaces of the mold.   4. The mold clamping apparatus according to claim 1, wherein the mold clamping apparatus is remodeled into a deformation prevention type mold clamping apparatus by additionally fixing only the mold mounting plate. .   The mold clamping device according to any one of claims 1 to 4, wherein notches are provided at four corners of the mold mounting plate so as not to interfere with the tie bar. It has a fixed mold board to which a fixed mold is attached, and a movable mold board that can be moved to and away from the fixed mold board, and has a movable mold attached thereto, and is fixed to the frame and has four corners. A toggle support plate connected to the fixed platen by a tie bar, a movable platen guided and slid by the tie bar disposed between the toggle support plate and the fixed platen, the movable platen and the It consists of a toggle device arranged between toggle support boards,
A double toggle type clamping device that applies a fastening force to bring the movable mold plate close to the fixed mold plate and clamps the movable mold plate and the fixed mold plate;
The movable mold plate and / or the fixed mold plate are:
A power receiving panel that receives the fastening force, and a mold mounting board that can be attached to and detached from one surface of the power receiving panel and to which the movable mold and / or the fixed mold is attached. ,
The anti-mold side of the mold mounting board has a tapered frustum-like or columnar connecting portion toward the power receiving board, and the mold side has a mold mounting surface, respectively.
A mold clamping device, wherein the anti-mold side surface of the connecting portion and the mold side surface of the force receiving plate are brought into contact with each other and fixed together.

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